Proposal for back-porting JFR to OpenJDK8u

Mario Torre neugens at
Tue Jan 29 11:45:30 UTC 2019


I'll help with the review, it may take a few days since I'm totally
absorbed by FOSDEM right now. Btw, is any of you coming?


On Tue, Jan 29, 2019 at 12:42 PM guangyu.zhu <guangyu.zhu at> wrote:

> Hi there,
> JFR backport patch has been uploaded to cr.openjdk. Please have a review
> for the patch.
> Webrev:
> The original patch comes from webrev:
> . We ported it to jdk8u192-b26 and passed most of the jfr jtreg tests on
> Linux/x86-64 platform. Some features related to Module, AOT and log level
> are removed because jdk8 does not support them.
> We have added a new option ‘EnableJFR’ to enable or disable the JFR
> feature. It’s disabled by default. To enable it, you can start java with
> ‘-XX:+EnableJFR’.  For example:
> java -XX:+EnableJFR -XX:StartFlightRecording=duration=1m,filename=rec.jfr
> MyApp
> When running the jtreg test, please add the extra option
> '-vmoption:-XX:+EnableJFR'. Otherwise the test case will not execute
> correctly. Here is an example of running jfr jtreg test:
> make test JTREG_TEST_EXTRA_OPTIONS=-vmoption:-XX:+EnableJFR TEST=jdk_jfr
> There is one more thing worth noting, please use jmc version 7.0 or later
> to open the jfr record file.
> Your suggestions and comments are welcome.
> Thanks,
> Guangyu Zhu
> ------------------------------------------------------------------
> Sender:李三红(三红) <sanhong.lsh at>
> Sent At:2018 Dec. 17 (Mon.) 21:21
> Recipient:Andrew Haley <aph at>; Mario Torre <
> neugens.limasoftware at>
> Cc:jdk8u-dev <jdk8u-dev at>
> Subject:Re: Proposal for back-porting JFR to OpenJDK8u
> Thanks for comments, we are preparing our internal patches for webrev.
> In the meantime, Martijn/ Andrew mentioned we can use AdoptOpenJDK to
> produce technical preview build.
> Would like to know this... can Martijn point us some guide somewhere?
> Thanks!
> Sanhong
> -----邮件原件-----
> 发件人: Andrew Haley [mailto:aph at]
> 发送时间: 2018年12月13日 3:03
> 收件人: Mario Torre <neugens.limasoftware at>; 李三红(三红) <
> sanhong.lsh at>
> 抄送: Volker Simonis <volker.simonis at>; jdk8u-dev at
> 主题: Re: Proposal for back-porting JFR to OpenJDK8u
> On 12/12/18 1:44 PM, Mario Torre wrote:
> > I think the first thing to do would be to post the patch for review, a
> > shared repository would make the review process a bit more complex I
> > think, and only makes sense if there is a need to work further on the
> > patch collectively.
> Yes, exactly. That's the normal process, and it's the best place to start.
> --
> Andrew Haley
> Java Platform Lead Engineer
> Red Hat UK Ltd. <>
> EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671

Mario Torre
Associate Manager, Software Engineering
Red Hat GmbH <>
9704 A60C B4BE A8B8 0F30  9205 5D7E 4952 3F65 7898

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